Now showing items 1-20 of 21

    • A general analysis of the impact of digitization in microwave correlation radiometers 

      Bosch Lluís, Xavier; Ramos Pérez, Isaac; Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park (2011-06)
      Article
      Open Access
      This study provides a general framework to analyze the effects on correlation radiometers of a generic quantization scheme and sampling process. It reviews, unifies and expands several previous works that focused on these ...
    • Advanced architectures for real-time delay-doppler map GNSS-reflectometers: the GPS reflectometer instrument for PAU (griPAU) 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac (2010-07-15)
      Article
      Restricted access - publisher's policy
      In recent years Global Navigation Satellite System’s signals Reflectometry (GNSS-R) has stood as a potential powerful remote sensing technique to derive scientifically relevant geophysical parameters such as ocean altimetry, ...
    • Altimetry study performed using an airborne GNSS-reflectometer 

      Rodríguez Álvarez, Nereida; Acevo Herrera, René; Aguasca Solé, Alberto; Valencia Domènech, Enric; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Bosch Lluís, Xavier; Ramos Pérez, Isaac (2010)
      Conference lecture
      Open Access
      The Global Navigation Satellite Signals Reflections (GNSSR)techniques have been widely used for remote sensing purposes retrieving geophysical parameters over different types of surfaces. Over the ocean, altimetry or sea ...
    • Calibration, performance, and imaging tests of a fully digital synthetic aperture interferometer radiometer 

      Ramos Pérez, Isaac; Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena (2012-06-28)
      Article
      Restricted access - publisher's policy
      This work presents the calibration, characterization, and imaging tests of the Passive Advanced Unit-Synthetic Aperture instrument (PAU-SA). PAU-SA is a fully digital -shaped two-dimensional synthetic aperture interferometric ...
    • Common mathematical framework for real and synthetic aperture by interferometry radiometers 

      Bosch Lluís, Xavier; Ramos Pérez, Isaac; Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2014-01)
      Article
      Restricted access - publisher's policy
      This work focuses on the relationship between real and synthetic aperture radiometers giving a general and common mathematical framework for both of them. It will be demonstrated that a real aperture radiometer array ...
    • Design and first results of an UAV-borne L-band radiometer for multiple monitoring purposes 

      Acevo Herrera, René; Aguasca Solé, Alberto; Bosch Lluís, Xavier; Camps Carmona, Adriano José; Martínez-Fernández, José; Sánchez-Martín, Nilda; Pérez-Gutiérrez, Carlos (2010-06-29)
      Article
      Open Access
      UAV (unmanned Aerial Vehicle) platforms represent a challenging opportunity for the deployment of a number of remote sensors. These vehicles are a cost-effective option in front of manned aerial vehicles (planes and ...
    • From field experiments to salinity products: a tribute to the contributions of Jordi Font to the SMOS mission 

      Camps Carmona, Adriano José; Gabarró Prats, Carolina; Vall-Llossera Ferran, Mercedes Magdalena; Blanch Boris, Sebastián; Aguasca Solé, Alberto; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Turiel Martínez, Antonio; Portabella, Marcos; Ballabrera Poy, Joaquim; González Gambau, V.; Martinez, Justino; Villarino Villarino, Ramón; Monerris Belda, Sandra; Bosch Lluís, Xavier; Sabia, Roberto; Talone, Marco; Piles Guillem, Maria; Pablos Hernández, Miriam; Valencia Domènech, Enric (2016-09-01)
      Article
      Open Access
      This article summarizes some of the activities in which Jordi Font, research professor and head of the Department of Physical and Technological Oceanography, Institut de Ciències del Mar (CSIC, Spanish National Research ...
    • Land monitoring using GNSS-R techniques: a review of recent advances 

      Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Forte Veliz, Giuseppe Francesco; Ramos Pérez, Isaac; Alonso Arroyo, Alberto; Bosch Lluís, Xavier (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      Soil moisture is required to improve meteorological and climate predictions. Global soil moisture maps are nowadays produced daily from SMOS satellite data, with a basic spatial resolution of ~50 km. Recently, using data ...
    • New instrument concepts for ocean sensing: analysis of the PAU-radiometer 

      Camps Carmona, Adriano José; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Marchán Hernández, Juan Fernando; Izquierdo Fernandez, Benjamin; Rodríguez Álvarez, Nereida (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-10-31)
      Article
      Open Access
      Sea surface salinity can be remotely measured by means of L-band microwave radiometry. However, the brightness temperature also depends on the sea surface temperature and on the sea state, which is probably today one of ...
    • Ocean surface's scattering coefficient retrieval by delay-doppler map inversion 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Hyuk, Park; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac (2011-07)
      Article
      Restricted access - publisher's policy
      Global navigation satellite system reflectometry of signals is a promising technique to remotely sense a number of Earth’s geophysical parameters, and it has been proposed for ocean monitoring applications such as mesoscale ...
    • On the design of microwave radiometers with digital beamforming and polarization synthesis for earth observation. 

      Bosch Lluís, Xavier (Universitat Politècnica de Catalunya, 2011-03-30)
      Doctoral thesis
      Open Access
      Actualment, la comunitat científica ja disposa de les primeres mesures radiomètriques a banda L, polarimètriques i multi-angulars fetes de l’espai. Això és gràcies al recent llançament de la missió de la Eurepean Space ...
    • On the use of GNSS-R data to correct L-band brightness temperatures for sea-state effects: results of the ALBATROSS field experiments 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac; Eugenio, Francisco Javier; Marcello, Javier (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Restricted access - publisher's policy
      Sea surface salinity is a key oceanographic parameter that can be measured by means of L-band microwave radiometry. The measured brightness temperatures over the ocean are influenced by the sea state, which can entirely ...
    • Optimum intercalibration time in synthetic aperture interferometric radiometers: application to SMOS 

      Ramos Pérez, Isaac; Bosch Lluís, Xavier; Camps Carmona, Adriano José; González Gambau, Veronica; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena; Forte Veliz, Giuseppe Francesco (2012)
      Article
      Restricted access - publisher's policy
      Interpolation strategies for calibration of the Soil Moisture and Ocean Salinity (SMOS) mission of the European Space Agency are tested and compared. Calibration strategy (how and how often) is critical in achieving the ...
    • PAU instrument aboard INTA MicroSat-1: A GNSS-R demonstration mission for sea state correction in L-band radiometry 

      Rius, Antonio; Angulo, Manuel; Chavero, Sergio; Martinez, Pedro; Galindo, Juan Jose; Mollfulleda, Antonio; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Valencia Domènech, Enric; Ramos Pérez, Isaac; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Hyuk, Park; Alcayde Egea, Antonio (IEEE, 2011)
      Conference lecture
      Restricted access - publisher's policy
      Global Navigation Satellite System (GNSS) Reflectometry was originally proposed for mesoscale altimetry, but today its feasibility for sea state, soil moisture, vegetation and snow height has already been demonstrated. ...
    • PAU-SA: a synthetic aperture interferometric radiometer test bed for potential improvements in future missions 

      Ramos Pérez, Isaac; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park; Forte Veliz, Giuseppe Francesco; Vall-Llossera Ferran, Mercedes Magdalena (2012-06)
      Article
      Open Access
      The Soil Moisture and Ocean Salinity (SMOS) mission is an Earth Explorer Opportunity mission from the European Space Agency (ESA). Its goal is to produce global maps of soil moisture and ocean salinity using the Microwave ...
    • Retracking considerations in spaceborne GNSS-R altimetry 

      Hyuk, Park; Camps Carmona, Adriano José; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Carrero Luengo, Hugo (2012-10)
      Article
      Restricted access - publisher's policy
      The European Space Agency Passive Reflectometry and Interferometry System In-orbit Demonstrator (IoD) aims to perform mesoscale altimetric observations by measuring the Global Navigation Satellite System (GNSS) opportunity ...
    • Review of GNSS-R instruments and tools developed at the Universitat Politecnica de Catalunya-Barcelona Tech 

      Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac; Valencia Domènech, Enric; Tarongí Bauzá, José Miguel; Hyuk, Park; Carreño Luengo, Hugo; Alonso Arroyo, Alberto; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Forte Veliz, Giuseppe Francesco; Querol Borràs, Jorge (2014)
      Conference lecture
      Restricted access - publisher's policy
      Reflectometry using Global Navigation Satellite System's signals of opportunity (GNSS-R) was originally conceived in the early 90s for mesoscale altimetry, and since then, many studies have shown its applicability to other ...
    • Snow monitoring using GNSS-R techniques 

      Rodríguez Álvarez, Nereida; Aguasca Solé, Alberto; Valencia Domènech, Enric; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Hyuk, Park; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      GNSS-R techniques are currently being studied to remotely sense a number of geophysical parameters over different types of surfaces [1-6]. The Interference Pattern Technique (IPT) is based on the measurement of the ...
    • Study of maize plants effects in the retrieval of soil moisture using the interefence Ppttern GNSS-R technique 

      Rodríguez Álvarez, Nereida; Bosch Lluís, Xavier; Acevo Herrera, René; Aguasca Solé, Alberto; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Ramos Pérez, Isaac; Valencia Domènech, Enric (2010)
      Conference lecture
      Open Access
      The use of Global Navigation Satellite Signals Reflections (GNSS-R) techniques to retrieve geophysical parameters from surfaces has been increased in the recent years. These techniques have resulted in suitable tools to ...
    • Validation and experimental tests of the PAU-synthetic aperture radiometer 

      Ramos Pérez, Isaac; Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      This paper presents calibration and the radiometric performance of the Passive Advanced Unit Synthetic Aperture (PAU-SA) in order to verify the instrument's characterization.